[IR][sanitizer] Add module flag "frame-pointer" and set it for cc1 -mframe-pointer={non-leaf,all}

The Linux kernel objtool diagnostic `call without frame pointer save/setup`
arise in multiple instrumentation passes (asan/tsan/gcov). With the mechanism
introduced in D100251, it's trivial to respect the command line
-m[no-]omit-leaf-frame-pointer/-f[no-]omit-frame-pointer, so let's do it.

Fix: https://github.com/ClangBuiltLinux/linux/issues/1236 (tsan)
Fix: https://github.com/ClangBuiltLinux/linux/issues/1238 (asan)

Also document the function attribute "frame-pointer" which is long overdue.

Differential Revision: https://reviews.llvm.org/D101016

1 files changed, 14 insertions, 1 deletions

diff --git a/llvm/lib/IR/Function.cpp b/llvm/lib/IR/Function.cpp
index 32c7b87..0887b5c 100644
--- a/llvm/lib/IR/Function.cpp
+++ b/llvm/lib/IR/Function.cpp
@@ -335,8 +335,21 @@ Function *Function::createWithDefaultAttr(FunctionType *Ty,
                                           unsigned AddrSpace, const Twine &N,
                                           Module *M) {
   auto *F = new Function(Ty, Linkage, AddrSpace, N, M);
+  AttrBuilder B;
   if (M->getUwtable())
-    F->addAttribute(AttributeList::FunctionIndex, Attribute::UWTable);
+    B.addAttribute(Attribute::UWTable);
+  switch (M->getFramePointer()) {
+  case FramePointerKind::None:
+    // 0 ("none") is the default.
+    break;
+  case FramePointerKind::NonLeaf:
+    B.addAttribute("frame-pointer", "non-leaf");
+    break;
+  case FramePointerKind::All:
+    B.addAttribute("frame-pointer", "all");
+    break;
+  }
+  F->addAttributes(AttributeList::FunctionIndex, B);
   return F;
 }